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Restructuring and Transaction Costs (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs | $ 258 | $ 49 | $ 84
Merger Integration [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs | 210 |  |
Noncash restructuring costs | 21 |  |
Transaction Costs [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Underwriting, bank, legal and accounting fees | 48 |  |
Reduction of workforce [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Noncash restructuring costs | 66 | 11 | 31
Reduction of workforce [Member] | Defined Benefit Settlements [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs | $ 41 | 9 | 7
Reduction of workforce [Member] | Employee Related Costs [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring and transaction costs |  | $ 41 | $ 84

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